Three-phase power supply network electromagnetic voltage transformer harmonic elimination protector

A voltage transformer, three-phase power technology, applied in the field of voltage transformer harmonic elimination protectors, can solve problems such as hidden dangers, system instability, voltage transformer neutral point imbalance, etc., achieve accurate limit and protection, ensure normal The effect of running and avoiding zero sequence voltage

Inactive Publication Date: 2010-12-29
张致良
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AI Technical Summary

Problems solved by technology

However, although this three-phase electromagnetic voltage transformer with a primary resonance eliminator can eliminate the ferromagnetic resonance problem of the system, it also has shortcomings. First, due to the existence of the resistance value, the voltage transformer primary The neutral point on the side of the voltage transformer is not directly grounded. When the system is running normally, this resistance will cause the neutral point of the voltage transformer to be unbalanced, so that the open delta winding of the voltage transformer will generate a zero-sequence voltage, thereby affecting the protection of the relay p

Method used

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  • Three-phase power supply network electromagnetic voltage transformer harmonic elimination protector

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Embodiment Construction

[0012] Referring to Figure 1, the primary side of the three-phase electromagnetic voltage transformer PT is electrically connected to the busbars A, B, and C of each phase of the three-phase power grid through the fuse RD, and the neutral point and the ground point of the primary side are connected in series. Harmonic protector PTC. The harmonic elimination protector PTC is composed of an ultra-high voltage ceramic capacitor C and a self-recovery fuse PPTC connected in parallel. Among them, the capacitor C has a large choice, and most of the capacitors can make the present invention realize its function. Ceramic chip capacitors, which have the advantages of high stability, are suitable for extremely long-term work under high voltage.

[0013] The resettable fuse PPTC uses REG-series products from American raychem company, which is not only suitable for electromagnetic voltage transformers of various voltage levels, but also has the characteristics of stable product quality and...

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Abstract

The invention relates to a voltage transformer harmonic elimination protector, in particular to a three-phase power supply network electromagnetic voltage transformer harmonic elimination protector, which comprises a capacitor. The capacitor is connected in parallel with a resettable fuse to form the harmonic elimination protector; and the harmonic elimination protector is connected in series between a neutral point and a ground point of a primary side of a three-phase electromagnetic voltage transformer to prevent ferromagnetic resonance overvoltage. The three-phase power supply network electromagnetic voltage transformer harmonic elimination protector can effectively eliminate ferromagnetic resonance caused by using the electromagnetic voltage transformer in a power supply system so as to prevent the generated overvoltage from damaging multiple kinds of equipment in the system, cannot influence normal operation of other protectors in the power supply system, has the advantages of simple structure, convenient use and low manufacturing cost and use cost, and can be widely applied to the power supply system of the 3 to 35kV three-phase power supply network electromagnetic voltage transformer.

Description

【Technical field】 [0001] The invention relates to a voltage transformer harmonic elimination protector, in particular to a three-phase power grid electromagnetic voltage transformer harmonic elimination protector. 【Background technique】 [0002] At present in our country, based on economic reasons, the 3-35kV system in the three-phase power grid adopts the three-wire system with the neutral point not grounded. In order to monitor the insulation status of the system, three-phase voltage transformers are connected to the power plant, substation, and generator bus. When connecting, the primary side (high voltage) winding of the three-phase voltage transformer is connected in a star shape, and the neutral point of the star shape is directly grounded. For cost considerations, three-phase voltage transformers basically use electromagnetic voltage transformers. This kind of power system using three-phase electromagnetic voltage transformers has some changing factors to the ground...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02H3/06
Inventor 张致良
Owner 张致良
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